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Daydream believer

For years, brain scientists viewed a wandering mind as merely a lapse in cognition. But recent studies have found that we lose concentration shockingly often. A 2007 study by Michael Kane of the University of North Carolina found that our minds drift away from our tasks fully one-third of the time. And this suggests that daydreaming can actually be useful — because if it were such a bad thing, it’s unlikely that we’d do it so often.

Why do our minds wander? Brain-scanning technology has uncovered some clues. It turns out that when your mind drifts, your temporal lobes — which are associated with processing long-term memories — become busier. So when you float off into a reverie, you’re actually doing important data-storage work.